The Maglite LMXA601 6 Cell MAG-NUM STAR Xenon Replacement Bulb for 6D & 6C Maglite They are up to 96 brighter than previous MAG-NUM STAR bulbs and use pressurised Xenon gas for improved efficiency The blubs are fitted with a tougher glass housing and a stronger filament These Second Generation Magnum Star Xenon bulbs are now tested at up to 96 brighter than the previous Magnum Star bulbs so if you have an older Maglite upgrade today and experience the next generation in Magnum Star advanced lamp technology